. >> ryssdal: jim brown is wtp's outside counsel. >> they're an issue advocacy group and they're allowed to engage in lobbying and, as such, they don't need to register their activities with the state of montana. >> ryssdal: but as unsworth dug deeper, he began to suspect that the different groups on the mailers weren't really that different at all. >> the common denominator appeared to be a chap named christian lefer. christian lefer had signed some of the paper work. his name appeared on some of the paperwork. my name is christian lefer, and i'm the creator of getnonprofitstatus.com and the nonprofit launch kit. >> ryssdal: lefer had come to montana back in the mid-2000s to work on conservative causes. he turned out eventually to be the director of strategy for wtp. but when unsworth tried to learn more about lefer and wtp's activities, he had trouble getting answers. until, he got a big break. >> we came across what i'd call a friendly witness, someone who was directly involved, appeared to have been directly involved in the activity, who became t dissatisfied and had some materials,